SOLUTION: solve a algebra expession. dart wheel has 20 numbers 1-20. Write an expression hitting a number equal to the number. Each expression must include each of the numbers 1, 2, 3, and 4

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Question 1155402: solve a algebra expession. dart wheel has 20 numbers 1-20. Write an expression hitting a number equal to the number. Each expression must include each of the numbers 1, 2, 3, and 4 exactly once, but no other number
Answer by ikleyn(52778) About Me  (Show Source):
You can put this solution on YOUR website!
.

In your post, I see this phrase 

    Write an expression hitting a number equal to the number.

I really do not understand what does it mean.

Could you clarify, please ?